Microsoft has just announced that they have "released an early preview of the Parallel Extensions to the .NET Framework (ParallelFX) technology." I haven't had a chance to check this out yet, but it looks like it will provide a new API for managing threading. What looks especially interesting are the multi-threaded foreach loops.

I don't want to say too much because I really don't know much about it, but check out the announcement on Somasegar's blog, Parallel Extensions to the .NET FX CTP.